d and f BLOCK ELEMENTS

What distinguishes Mendeleev's approach from that of Meyer in validating the Periodic Law?

• Mendeleev used atomic number, Meyer used atomic weight
• Mendeleev focused on gases, Meyer on solids
• Mendeleev used prediction of new elements, Meyer used graphical representation of properties
• Mendeleev worked alone, Meyer collaborated

Which statement best describes the evolution from Dobereiner's triads to Mendeleev's table?

• From a table to a list
• From focusing on atomic number to atomic weight
• From observing patterns in small groups to creating a comprehensive periodic system
• From predicting elements to measuring properties

What is the significance of the fact that Dobereiner's triads showed intermediate properties, not just intermediate atomic weights?

• It proved elements could transform into each other
• It was purely coincidental
• It indicated elements were made of light
• It suggested a direct correlation between atomic weight and chemical behavior

What major scientific recognition did John Newlands receive for his work on octaves, and when?

• Nobel Prize in Chemistry in 1901
• Davy Medal from the Royal Society in 1887
• Copley Medal from the Royal Society in 1890
• Priestley Medal in 1900

Why is the work of Lothar Meyer considered equally important to Mendeleev's in establishing the Periodic Law?

• He discovered the electron
• He arranged elements by atomic number first
• He independently proposed the same fundamental principle and provided graphical evidence
• He predicted more elements than Mendeleev